Riveter.



J. L. BERIJARD.

RIVETER.

APPLICATION FILED raw. 5, 1913.

2 SHEETS-SHEET I.

Patented Dec. 7, 1915.

FIG. 2

v IIwEWmw WITNES$E$ '1. L. BERNARD.

RIVETER.

APPLICATION FILED NOV. 5 1913..

Patented Dec. 7, 1915.

2 $HEETS-SHEET 2.

INVENTIH WITNESSES RIVE'EER.

Specification oz" Patent.

Patented Deeft, 191

Application filed November 5, 3913. Serial Ito. 589,362.

T 0 (ZZZ Minna it may concern Be it known that l. James L. BERNARD, a citizen of the United States, residing at Beaver, in the county of Beaver and State of Pennsylvania, have invented a new and useful lliveter, of which the following isa specification.

My invention. relates to the class of ap pliances used in fabricating the built-up members of bridges, boilers, tanks. roofs and similar structures. in upsetting the ends of rivets and torn'iing the second of the two heads thereon to secure together the parts of such structures, and more particularly relates to the construction and arrangement of the driving niechanisn-i, whereby the rivet snaps or sets are actuated in the riveting operations.

The invention, while not limited to such use, is particularly adaptable in-connection with portable riveters employed in shop and field work.

One object of the invention is to provide a, motor driven riveter having novel means whereby the rivet sets or snaps are positively actuated in the rivet heading operations.

Another object of this invention is to provide a power driven riveter having novel. means for operating; the rivet snaps where by inaccuracies in thickness of the materials being riveted. irregularities in the length of the rivets being); headed. and accidentally faulty :uljustlnents ot' the rivetsnaps are compensated for to the end that breakage or other damage to the apparatus is avoided and overcome.

A further object of my invention is to provide a power actuated riveter having novel means whereby successive rivets are upset with a constant pressure and are maintained under such pressure for any desired time interval.

it still i i'n'ther object of the invention is to provide a riveter having a novel arrangement of parts whereby the relatively reciprocatory vi vet snaps are actuated by an electric or YG tary .no or.

Still fuitber objects of '1, v invention will be disi'wloscd hereinafter a he apparatus is more fully described and claimed.

Referring to the drawings forming part of this specification, Figure lis a side elevation. partly in section, showing one term of riveter as constructed and arranged in accordance with my invention. Fig; 2 is a plan of the apparatus shown in Fig. l, with the worm wheel cover removed. for the sake l n i Y I of Clfittlipfibh. l 1g. 3 is a tiont end elevation partly in section, of the apparatus shown in rigs. i. and 2, the section being taken on with a throat 5 therebetween inwhich the;

bottom rivet set or snap (5 and top rivet set or snap 7 are operatively mounted. The upper jaw t is provided with a vertically extending .bushed opening 8 in its outer end in which a lengthwise reciprocating ram 9' is mounted, and adjustably secured to the lower end of the ram is a rivet snap holder to which the upper or reciprocating rivet snap 7 is adjustably secured. The-upper end of the ram 9 is pivoted by the. pin 10 to the lower end of a link 11 and the opposite end of the link 11 is connected by the pivot pin 12 to one end of the links 13, 13. The links 13 are connected by their other end to the crank pins 14 on the cranks 15 which may be conveniently formed integrally on the ends of the crank shaft 16. as shown. The crank shaft 16,.whicl1 is mounted in suitable capped bearings 17 formed on the top of the housing); 2 of the riveter is provvided with a worm wheel 18 (made in sections as shownl and which is keyed or otherwise ecurc l on the shaft 16 to rotate the crank shaft when the worm wheel is actuated.

Meshing with the teeth of the sectional worm wheel 13 is a worm 19 which preterably is formed integral on the worm shatt 20 and which extends lengthwise below the worm wheel. being mounted in the thrust bearings 21. 21 formed onthe housing The worm shaft 20 is provided with thrust collars 22 nvhich engage. suitable annular thrust rings forming part of the thrust bearll'lfIS 21.

Secured on one end of the worm shaft 20 is a bevel gear 24. the teeth of which mesh with the teeth of the bevel pinion 25 which is keyed to the end of the armature'shaft 26 of an electric motor 27. The motor 27 is rigidly @cured on the housing 2 of the riveter and a flywheel 28 is secured on one end 'of the armature shaft 26. its in the type of rivcterillustrated the armature shaft of the motor 27 extends in a vertical direction when the motor is mounted on, the housing 2, as"

is'pro- .4

I the rivet snap shown, an adjustable step bearing 29 vided on the housing 2 to engage with the. end of and holdthe armature shaft 26 in ;.the desired lengthwise position within the fields of the motor p The worm wheel 18 asshown is loosely mounted. upon, the crank shaft and a jaw clutch is provided to operatively he faces 30 one jaw member of the clutch are f r formed integrally on the hub 31 of the worm .Qfwheel 18, [and the other jaw member 32 is sliding'ly secured on the shaft by'nieans of a suitable feather so as to permit of its jaw v faces 33 being moved lengthwise on the shaftinto and out of operative engagement with the jaw faces on the worm wheel hub 31.

An operating lever 35 is pivoted on the housing 2 of the riveter and is provided with a forked end 35 having antifriction rollers 34, 34 engaging with a recess 36 in the pethe clutch to manually operate the clutch in connecting and disconnecting the worm wheel 18 from the crank shaft 16 in starting and stopping the riveting operations.

The pivot pin 12by which the links 13 are connected to one end of 11 forming one of the toggle levers of the criveter is also connected to one end of links 37 forming the other toggle levers of the riveter. The lower ends of the toggle levers 37 areconnected by a pivot pin 38 to one end of the rocking arms or levers 39 which extend, one on each side of the housing 2 to the rear end of the riveter. The rocking levers 39v are pivoted at an intermediate point in their length upon pins or stub shafts 40 on the housing 2, and the rear ends of the rocking levers 39 are connected together by a cross bar 41. The cross bar 41 forms a support which engages with one end of the series of helical springs 42 secured atthe rear end of the housing 2, a bracket or shelf 43 being formed integrally on the rear end of the housing 2-to support the lower. ends of the springs 42. Adjusting bolts44 having screw threaded ends extend throughthe springs and through suitable openings in the bracket 43 and the cross bar ['41 to regulate the amount of compression when the :as is done" in using the apparatus shown. The lug '46 on the sides of the.housing 2 are put upon the springs, so that the springs will have the desired resistance to rocking movement thereof in the operation of the riveter.

A bar 45,'--projecting from the rear end of the riveter'forms a handle for manipulating the 'riveter' in positioning the apparatus, 'riveter is suspended from a sling,

provided to form stops limiting the rocking "movement in one direction of the arms 89.

connect the" jaw member 32 of the arm or linkrivet snap (3.

wvill now be described.

The parts having been assembled as shown,

on the ram 9 to locate the rivet snaps 6 and 7 at the desired distance apart. The riveter, either before or after adjusting the rivet snaps, is suspended by asling from a crane or other suitable carrying device, so as to permit of spect to the work to be riveted, in position for riveting. The lower rivet snap 6 is then placed in engagement 'with the formed head of a rivet which is to be upset in forming the second head thereon. The motor 27, if not in operation, is now started and the lever 35 is moved to shift the movable member of the jaw clutch so as to bring the jaw upon continuing the operation of the wormwheel, the toggle links 11 and 37 are caused to move successively again into the same positions, but in the reverse order. toggle links are moved from the position shown into the positions A, B and C, the ram 9 and the rivet snap 7 on the lower end the riveter being placed, with re- 7 and its holder are adjusted As the crank As the thereof are caused to descend and the rivet snap 7 first engages with the end of the rivet to be upset and then displaces the metal to fill the hole through which the rivet extends and forms the rivet head. It will be noted by a comparison of the positions A,

B, etc., of the pivot" pin 12 with th positions A, B, C, etc, of the crank pin that during the major portion of the movement of the swinging upper ends of the toggle levers 11 and 37, (those connected to the pivot pin movement of the rivet snap 7 towardthe Owing to the pressure put 12) there is but slight downward upon the rivet snaps in upsetting the rivets being resisted bv the springs 42 through the pivoted arms 89, the rivets are always upset with the same pressure, this pressure being varied at will by adjusting the tension on the springs. Should, in the rivet upsetting operation, the materials happen to be of a greater thickness than supposed, or should the rivet being upset be of greater length than intended, or, for other reasons, the material between the rivet snaps be of greater amount than supposed, a greater strain will be putupon the ram 9 than intended. To take care of any such added strains and to prevent breakage or other damage of the apparatus due to such causes, the arms 3.) will in such case swing on their pivot pins 40 and compress the springs 42 on the rear end of the apparatus so that the full stroke of the upper end of the toggle links 11'- and 37 can be accomplished while the distance the rivet snap .7 travels toward the rivet snap (3 is kept constant or some what lessened. In other words, the ram 9 and rivet snap 7 are yieldingly secured to the housing of the riveter so as to provide a variable length stroke of the rivet snap with a constant rocking movement of the toggle levers for actuating the ram and rivet snap, and the force necessary to upset the rivets'in. forming the heads is less than that necessary to compress the springs l2, as is done when the rocking lever 31) is caused to move. It should be noted that the compression of the springs produces a substantially constant pressure upon the rivet between the snaps, during the time that the springs are under compression, or during the time that the rocking levers 39 have moved. In other words, rivcters constructed in accordance with my invention will maintain a constant pressure on the rivet for a pro-determined length of time. both the pressure and the time interval being varied as found necessary or desirable between successive riveting operations.

The advantages of my invention will be apparent to those skilled in the art. By means of my improved apparatus a riveter is provided having power-driven rivet snaps.

The rivet snaps are vieldingly held, so that inequalities in the thickness of the materials operated upon are automatically cared for and possible disarrangement, breakage or other damage to the apparatus is avoided and prevented. The apparatus is compact, durable. and simple in construction.

Modifications in the construction and arrangcmcnt of the parts may bemade Without departing from my invention.

The novel features of my invention are applicable to shop tools 'v'hichare per1na-' nently erected upon suitable foundations.

The mechanism connecting the toggle links with the motor may "be changed, the

type of motor may be other than that shown,

and other variations may be made withoutdeparting from my.invention as defined in the appended claims.

1. A riveter comprising in combination, a frame having jaws to support opposed rivet snaps, a reciprocatory ram mounted on one jaw to which one rivet snap is secured, a toggle mechanism for actuating said ram, means yieldingly mounted on the frame by which the toggle mechanism is secured to the frame. a motor and means operatively connecting the motor and toggle mechanism.

A rivetcr connirising in combination a frame having jaws to support opposed rivet snaps, a reci n'ocatory ram mounted on one jaw to which one rivet snap is secured, a toggle mechanism for actuating said ram, a pivoted arm yieldingly mounted on the frame by which the toggle mechanism is secured to the frame, a motor. and means 0 eratively connecting the motor and togg fe mechanism. 4 i

3. A rivliter comprising in combination a frame having jaws tosupport opposed rivet snaps, a reciprocatory ram mounted on one jaw to which onerivet snap is secured, a toggle mechanism for actuating said ram, a pivoted arm on the frame to which said toggle mechanism is pivotallysecurechyielding means connecting one end of said arm to said frame. a driving motor, and means operatively connecting the motor and toggle mechanism.

4, A riveter comprising in combination aframe having jaws to support opposed rivet snaps, a reciprocatory ram mounted on one jaw to which one rivet snap is secured. a toggle mechanism tonictuate the ram, pivoted arm to which said toggle mechanism is pivotally seeured,a helical spring yieldingly connecting one end of said arm to the frame, a driving motor, and means operatively connecting the motor and toggle mechanism.

In testimony whereof, I have hereunto set my hand.

' JAMES L. BERNARD. Witnesses FRANK B. THoMPsoN. R. F. BALL. 

